I have a question about one of the methods used to draw the alpha helix structures in proteins. This is a typical drawing from Wikipedia of a small protein transcriptional activator Myb; http://en.wikipedia.org/wiki/File:Protein_MYB_PDB_1guu.png Now that drawing looks typical of any protein containing alpha helix. But here is a different protein that also has alpha helix. Its from an AT-rich interaction domain; http://en.wikipedia.org/wiki/File:PDB_1ig6_EBI.jpg In the second drawing, it looks like the alpha helix is copied or multiplied out several times in the drawing. Its drawn like as if the scientist drew his protein and copied the same image into the picture several times creating a much thicker looking protein. In the case of that second image, it looks like there are about 6 or 7 copies of the same protein, all wrapping around each other! My Question; Is there a special name for this method of "copying" or doubling up the proteins in the image? And is it because, in reality, these proteins actually do wrap around each other several times, or something like that? (Maybe i should have posted this message in the chemistry forum) Thank, John.